How to integrate leveldb database to FreeRadius-server-2.2.9

[Gengxiang Meng]

Hi all,
         I porting freeradius-server-2.2.9  to my system, I have a leveldb(https://github.com/google/leveldb) database to manage local users.
I check the module support list in source code src\modules, not sure which module I should use to integrate  with my leveldb,   is it rlm_dbm?
(looks like rlm_dbm depend on gdbm, but I don't want to use gdbm to manage my database)
Do you already have another module name like "rlm_leveldb"?  Thanks your support.

Thanks,
Ross